134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
/*
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Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
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<http://rt2x00.serialmonkey.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the
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Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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Module: rt2x00lib
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Abstract: rt2x00 HT specific routines.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "rt2x00.h"
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#include "rt2x00lib.h"
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void rt2x00ht_create_tx_descriptor(struct queue_entry *entry,
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struct txentry_desc *txdesc,
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const struct rt2x00_rate *hwrate)
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{
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
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struct ieee80211_tx_rate *txrate = &tx_info->control.rates[0];
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
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if (tx_info->control.sta)
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txdesc->u.ht.mpdu_density =
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tx_info->control.sta->ht_cap.ampdu_density;
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txdesc->u.ht.ba_size = 7; /* FIXME: What value is needed? */
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txdesc->u.ht.stbc =
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(tx_info->flags & IEEE80211_TX_CTL_STBC) >> IEEE80211_TX_CTL_STBC_SHIFT;
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/*
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* If IEEE80211_TX_RC_MCS is set txrate->idx just contains the
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* mcs rate to be used
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*/
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if (txrate->flags & IEEE80211_TX_RC_MCS) {
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txdesc->u.ht.mcs = txrate->idx;
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/*
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* MIMO PS should be set to 1 for STA's using dynamic SM PS
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* when using more then one tx stream (>MCS7).
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*/
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if (tx_info->control.sta && txdesc->u.ht.mcs > 7 &&
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((tx_info->control.sta->ht_cap.cap &
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IEEE80211_HT_CAP_SM_PS) >>
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IEEE80211_HT_CAP_SM_PS_SHIFT) ==
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WLAN_HT_CAP_SM_PS_DYNAMIC)
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__set_bit(ENTRY_TXD_HT_MIMO_PS, &txdesc->flags);
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} else {
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txdesc->u.ht.mcs = rt2x00_get_rate_mcs(hwrate->mcs);
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if (txrate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
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txdesc->u.ht.mcs |= 0x08;
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}
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/*
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* This frame is eligible for an AMPDU, however, don't aggregate
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* frames that are intended to probe a specific tx rate.
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*/
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if (tx_info->flags & IEEE80211_TX_CTL_AMPDU &&
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!(tx_info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE))
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__set_bit(ENTRY_TXD_HT_AMPDU, &txdesc->flags);
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/*
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* Set 40Mhz mode if necessary (for legacy rates this will
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* duplicate the frame to both channels).
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*/
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if (txrate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH ||
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txrate->flags & IEEE80211_TX_RC_DUP_DATA)
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__set_bit(ENTRY_TXD_HT_BW_40, &txdesc->flags);
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if (txrate->flags & IEEE80211_TX_RC_SHORT_GI)
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__set_bit(ENTRY_TXD_HT_SHORT_GI, &txdesc->flags);
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/*
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* Determine IFS values
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* - Use TXOP_BACKOFF for management frames
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* - Use TXOP_SIFS for fragment bursts
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* - Use TXOP_HTTXOP for everything else
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*
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* Note: rt2800 devices won't use CTS protection (if used)
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* for frames not transmitted with TXOP_HTTXOP
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*/
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if (ieee80211_is_mgmt(hdr->frame_control))
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txdesc->u.ht.txop = TXOP_BACKOFF;
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else if (!(tx_info->flags & IEEE80211_TX_CTL_FIRST_FRAGMENT))
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txdesc->u.ht.txop = TXOP_SIFS;
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else
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txdesc->u.ht.txop = TXOP_HTTXOP;
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}
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u16 rt2x00ht_center_channel(struct rt2x00_dev *rt2x00dev,
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struct ieee80211_conf *conf)
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{
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struct hw_mode_spec *spec = &rt2x00dev->spec;
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int center_channel;
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u16 i;
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/*
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* Initialize center channel to current channel.
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*/
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center_channel = spec->channels[conf->channel->hw_value].channel;
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/*
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* Adjust center channel to HT40+ and HT40- operation.
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*/
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if (conf_is_ht40_plus(conf))
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center_channel += 2;
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else if (conf_is_ht40_minus(conf))
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center_channel -= (center_channel == 14) ? 1 : 2;
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for (i = 0; i < spec->num_channels; i++)
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if (spec->channels[i].channel == center_channel)
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return i;
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WARN_ON(1);
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return conf->channel->hw_value;
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}
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